pc-hack

PC HACK 3.61 source code (archival)
git clone http://frotz.net/git/pc-hack.git
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track.c (651B)

      1 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
      2 /* track.c - version 1.0.2 */
      3 
      4 #include "hack.h"
      5 
      6 #define	UTSZ	50
      7 
      8 coord utrack[UTSZ];
      9 int utcnt = 0;
     10 int utpnt = 0;
     11 
     12 initrack(){
     13 	utcnt = utpnt = 0;
     14 }
     15 
     16 /* add to track */
     17 settrack(){
     18 	if(utcnt < UTSZ) utcnt++;
     19 	if(utpnt == UTSZ) utpnt = 0;
     20 	utrack[utpnt].x = u.ux;
     21 	utrack[utpnt].y = u.uy;
     22 	utpnt++;
     23 }
     24 
     25 coord *
     26 gettrack(x,y) register x,y; {
     27 register int i,cnt,dist;
     28 coord tc;
     29 	cnt = utcnt;
     30 	for(i = utpnt-1; cnt--; i--){
     31 		if(i == -1) i = UTSZ-1;
     32 		tc = utrack[i];
     33 		dist = (x-tc.x)*(x-tc.x) + (y-tc.y)*(y-tc.y);
     34 		if(dist < 3)
     35 			return(dist ? &(utrack[i]) : 0);
     36 	}
     37 	return(0);
     38 }